NIKKEN SEKKEI URBANISM

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BUILT-IN RESILIENCENIKKEN SEKKEI URBANISMTECHNOLOGY & URBAN DEVELOPMENT096 _ 097Harumi Island District is an old part of the Tokyo Bay reclamation area and has long been used for public housing, warehouses, car dealers, and public utilities. Experiencing development pressure from central Tokyo in the late 1980s, the landowners formed a redevelopment consortium for the 10.5 ha project site on the Island. After going through more than 20 years of uctuating economic conditions, Harumi Island Triton Square opened in 2001, turning the area into a popular waterfront mixed-use development consisting of ofce towers, and residences as well as retail and cultural facilities. A variety of sustainable strategies have been applied to mitigate the site’s high risk of natural disaster, providing resiliency to market demands and optimizing efficiency in response to the limited resources on the artificial island. Along with the adaptation of damage-tolerant structures and exible floor designs, Triton Square introduced integrated building and operation strategies to reduce its energy consumption. Technologies like high efficient District Heating and Cooling system (DHC) with large-capacity heat storage tank were adapted to reduce the energy of air conditioning.Through the utilization of Variable Air Volume (VAV), Outdoor Air Cooling, large temperature-difference water supply, highly-efficient illumination and other technologies, the total energy consumption of Triton Square’s ofce buildings was reduced by 33%.A water management system was introduced to allow the collection andpurication of surface runoff water, DHC blow water and drainage waterthrough a central plant installed underneath the hall. With the help of this system, the annual potable water consumption of the whole development was reduced by approximately 40%.A waste sorting and weighing system allows the monitoring of waste, raising wider awareness for the need to reduce waste and minimize negative environmental impacts.m3/yearWater recycling(Average of 2001 to 2010)tons/yearWaste oilBatteriesPET bottlesStyrofoamCansGlass binsCardboardMixed paperOA joumalsMagazinesNewspapersIncombustible refuseCombustible refuseFood scrapsRefuse recycling(Average of 2001 to 2010)RainwaterAir-conditionerdrainageCooling towerblow waterIntermediatetreatment waterClean make-up waterPotable water50,000100,000150,000200,000250,000300,000350,000400,000450,000500,0003006009001,2001,5001,8002,1002,4002,7003,000Primary energy COP = supplied heat value / primary energy consumtion03006009001,2001,500Source : Heat SupplyBusiness Handbook, 2002High efficient district heating and cooling(DHC)1.41.21.00.80.60.40.20.0Primary energy conversion COPElevator and other sourcesof energy consumptionOutletsLightingAir-conditioning/ventilationAir-conditioning pumpCold heat and hot heatAnnual CO2 emission in kilograms per square meter(Office Building)Harumi DHC primary energyconversion COP=1.1901020304050607080902001200220032004200520062007200820092010Avg.Std.25%kg/year・㎡▲Recycling rate 40%Recycling rate 60%Daylight use(environment)HallGrand LobbyRainwater use(environment)Office TowerOutside air cooling(environment)Void core cornerbalcony(high function)DHC blow water recycling(environment )Large elevator(reliability)Refuse metering charge(environment)Rich planting and automaticsprinkling (environment)Large-capacitytrench (safety)TrenchDouble looping of internalpiping and wiring (reliability)Large-capacity heatstorage tank(environment)Installation of standbyunits (reliability)Center PlantServicewater tankWastewaterrecycling(environent)Rainwaterstorage tankRainwater use(environment)BEMS-based energymanagement(environment)Dispersed air-conditioners(higg-function and environment)VAV and VWV(environment)Large temperaturedifference water supply(environment)Outdoor unit space(high function)Parabola space(high function)Integrated DisasterPreventiorCenterCommercialfacilitiesMMMMMMHigh Efficiency DHCHarumi Island Triton Square | Tokyo, Japan, 2001 Site Area: 4.8 hectares | BUA: 440,000 sqm | Height: 45 floorsSustainable strategies applied in Triton Square

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